Use the last number plus 1
divide by 2 then use the
answer multiply by itself.
1+3+5+7
8Step 1 Use 7 + 1 =
Then use 8 ÷ 2 = 4
Step 2 use 4 x 4 = 16
16You will get the answer is
1 + 3 + 5 +…+ 11
Step 1 Use 11 + 1 = 12
Then use 12 ÷ 2 = 6
Step 2 use 6 x 6 = 36
36You will get the answer is
1) 1 + 3 + 5 +...+ 15
2) 1 + 3 + 5+...+ 21
3) 1 + 3 + 5 +...+ 19
4) 1+ 3 + 5 +...+ 25